| 名稱 羊角螺化石 | Name Clothoid fossil |
| 地質年代 / | Geological Age / |
| 描述 天然海螺 羊角螺化石，超级玉化 旋螺屬最早出現的時間，根據化石紀錄，可以上推至早白堊世，一直延續至今。在今日華北地區的熱河群義縣組的湖底沉積物 他們體形較小大多數為會呼吸空氣的淡水螺 | Descriptions The genus Gyraulus is known from the Early Cretaceous to the present. Fossils attributed to Gyraulus sp. have been found in the lakebottom sediments of the Yixian Formation in China, dating to 125 million years ago. |
| 地點 / | Location / |
| 參考 Reference / | |
| 編者 由 3A (10) 李曉峰 於 29/5/2018編寫 由3E (31) 葉曉澄 於4/6/2018編寫 由 3C (8) 何穎 於30/5/2019最後編改 | Editor Created by 3A (10) Lee Hiew Fung on 29/5/2018 3E (31) Yip Hiu Ching on 4/6/2018 Last modified by 3C (8) Ho Wing on 30/5/2019 |
